SR 450
- $699.95DSRP

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A powerful backpack sprayer/duster that easily converts from liquid to granular applications.

For both the distribution of liquid or solid insecticides, fertilizers, or herbicides, the low-emission, fuel-efficient STIHL SR 450 Backpack Sprayer has a larger, more powerful engine that provides a spray range 20% wider than previous models, taking 20% less time to spray the same area, depending on application. The SR 450 easily converts from misting to dusting applications without special tool...Read More

Important Information

Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…

WARNING! Improper use of any power tool may cause serious
or fatal injury. Read, understand and follow carefully the operating
and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.

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•2.6 oz. bottle makes 1 gallon mix

•5.2 oz. bottle makes 2 gallon mix

•6.4 oz. bottle makes 2 1/2 gallon mix

•12.8 oz. bottle makes 5 gallon mix

STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

For Your Safety

A lightweight frame made of nylon offers the ideal combination of durability and comfort. Rubber temple tips and nosepiece offer a pressure-free fit behind the ears and protection from slippage on the nose bridge area. Protective lenses filter 99% of harmful UV rays.

Class II reflective vest that is required for working along highways meets ANSI/ISEA 107-2004 standard. Longer tail in the back provides maximum reflective exposure for users running backpack blowers. Two front pockets and one chest pocket provide utility for carrying necessary items.
Available sizes: Medium, Large, X Large, XX Large

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All pricing on this site is Distributor Suggested Retail Price. This site strives to maintain accurate and current suggested retail pricing. However, dealers' actual prices may vary or change. Please confirm pricing with your dealer

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SR 450 Description

For both the distribution of liquid or solid insecticides, fertilizers, or herbicides, the low-emission, fuel-efficient STIHL SR 450 Backpack Sprayer has a larger, more powerful engine that provides a spray range 20% wider than previous models, taking 20% less time to spray the same area, depending on application. The SR 450 easily converts from misting to dusting applications without special tools or additional equipment, and air speed can be easily adjusted during use for greater application and less product waste. The SR 450 can also be used as a backpack blower for debris cleanup.

SR 450

SR 450

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SR 450 is rated 4.3 out of 5 by 24.

Rated 5 out of 5 by CenturionPest2014 from Machine is a beast!I bought my Stihl back in the spring of 2014 when I opened my company and I can tell you now finishing up my 4th mosquito season and servicing over 90 customers a month that this machine is practically bullet proof. Throttled out on an acre of property with nothing but English ivy it works like a champ. Use Stihl 2 cycle oil as recommended and change the plug every season and you'll be very happy. The diffuser design on the end could use some reworking, but a small tent bungee strap rigging on its fine.

Date published: 2017-09-13

Rated 5 out of 5 by Moodyslandscape from Awesome unitI bought one for mosquito control for my small Landscape Company yes it is heavy. However it does the job it starts up every time I have used mine all summer now and I have never had any significant issues.

Date published: 2017-08-29

Rated 1 out of 5 by Bobthebugman from Leaks.Wow. Stihl. Brand new. 5th backpack I've used from Stihl. All the others worked flawlessly. This one blows. Motor is very strong but the water continues to leak in spite of turning off the nozzle. There needs to be a shutoff inside the tank. This would help in two ways: 1 you wouldn't have to premix chemicals in a secondary container 2 it would never leak. You're better than this Stihl.

Date published: 2017-08-19

Rated 5 out of 5 by RODN27613 from EXCELLENT VALUE*Heavy as other have said*Tank needs gallon- quart graduations not liter for USA sales*Will pay for itself quickly

Date published: 2017-07-13

Rated 5 out of 5 by Dwight32609 from Bought mine a couple months agoHaven't had any issues yet, it appears heavy at first, but you have the tank on your back, so it'll lighten as the product disperses.

Date published: 2017-07-07

Rated 4 out of 5 by Deke0506 from Great product - except overall weight can post repetitive use issues.Wish Stihl would utilize a backpackers shoulder harness and restraint system to properly strap the unit to ones body and eliminate unit migration anytime the operator leans to one side or another, and then having to deal with sloshing liquid transfer. A proper backpackers harness would improve this unit 10fold!

Date published: 2017-07-02

Rated 5 out of 5 by Doug15 from Great Performing SprayerI purchased this sprayer to apply pest control in my yard. The SR450 is powerful enough to get high into my privacy hedges and trees. It also works great to move leave when I just need a reliable, powerful backpack blower.

Date published: 2017-06-22

Rated 5 out of 5 by Normf16 from Great productLove the product and works as expected. The diffusers on the end of the wand do not attach very securely. It would be nice if they had a better locking mechanism. The price is a bit high also, but it is a good product.

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STIHL IS THE NUMBER ONE SELLING BRAND OF GASOLINE-POWERED HANDHELD OUTDOOR POWER EQUIPMENT IN AMERICA.*

*"Number one selling brand" is based on syndicated Irwin Broh Research as well as independent consumer research of 2009-2017 U.S. sales and market share data for the gasoline-powered handheld outdoor power equipment category combined sales to consumers and commercial landscapers.

*A majority of STIHL gasoline-powered units sold in the United States are built in the United States from domestic and foreign parts and components.